Answer:
B. only the animals living in water
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The cell membrane functions as a selective barrier. We call these kind of membranes as differentially permeable or semi permeable membrane. It can decide what substances can pass in and out. Therefore it can surround the cytoplasm (which is the inside of a cell) to separate the cell's content from the surroundings.
Water is the body's most indispensable nutrient. Indispensable means the most essential, in this case, it's water.
